Borland International, 1988
Buku Referensi
Cobb, Stephen, author
Windcrest Books McGraw-Hill, 1991
Buku Teks
MicroPro International Corporation , 1988
Buku Teks
Axelrod, C. Warren, author
John Wiley & Sons, 1982
Buku Teks
Axelrod, Warman, author
Prentice-Hall, 1982
Buku Teks